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. 2019 Apr 8;19:336. doi: 10.1186/s12885-019-5566-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — Clinical course. The levels of serum carcinoembryonic antigen (CEA) dropped from 154.5 ng/mL to 30.9 ng/mL after the irradiation therapy and further decreased to 6.8 ng/mL at 3 months post treatment; however, the levels increased again to 19.7 ng/mL at 6 months after completion of the irradiation therapy